Project Description
This project was an integration of all lessons learnt during our Digital Systems design class.
For the project, we got together as teams of 4 to design and simulate a large digital clock display that actually works and can be powered from the main power supply.
This project involved utilizing decade counter ICs to ensure precise timekeeping, including seconds.
Through Logisim simulation, meticulous component selection, and prototyping (simulations),
our design aimed to guarantee accuracy to people while they viewed while maintaining a user-friendly experience.
The user friendliness included, adding an alarm bit, that sounded every 15 minutes for 4 second according to the requirements given and also, contains buttons for time setting.
a key design requirement for our project was to make our display large enough to be seen over 100m away from users.
This requirement caters to applications in public spaces, while mains power operation ensures continuous functionality.
The inclusion of a user-friendly time-setting mechanism and a distinctive beep every 15 minutes enhances user interaction and time awareness.
As an optional feature, out project (the digital clock) operates on a 12-hour timing system.
The project implementation involves circuit design, simulation, component selection, prototyping, and simulation.
This website is my (Tracey Agbevem) personal report on the project journey.
Project Components
Designing the 12-hour clock involved using the following components:
| Component | Actual Components | Use |
|---|---|---|
| Integrated Circuits | 74LS192, D flip-flop & Logic gates: AND, NAND & OR | For the main operations |
| 7-Segment Display Modules | 7-segment display, 7-segment display driver | To make and control the display |
| Crystal Oscillator | Quartz Crystal Oscillator, Resonator | Provide a stable clock signal for accurate timekeeping |
| Basic electrical components | Timing Resistors & capacitors, LEDs, LEDs, | Used for timing, current limiting, voltage division & form numeric characters |
| Connectors and Headers | Male and female headers, Jumper wires | Facilitate easy connections between the PCB and external elements |
| Power Supply Components | Voltage regulators, Diodes | Ensure stable power delivery to the components |
| Clock Source | 555 Timer IC | Generates clock pulses for the system |
| Buzzer, Buttons | Active Buzzer, Push buttons or switches | Periodic beep every 15 minutes, Buttons for time-setting |
| PCB (Printed Circuit Board) | Designed using EasyEDA | Designing the physical board for component placement and connectivity |
Team Project Images
Personal PCB Image
